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              1. PILGARD PVI
                • Overview
                • Compounding Information
                • Application

                Chemical Name

                N-(cyclohexylthio) phthalimide.  (CTP)

                Chemical Structure

                CAS Reg. No.

                17796-82-6

                Mol. Wt.

                261

                Product Specification

                Parameter

                Limits

                Test Method

                Product form

                Powder DS (Crystalline) 

                -

                Color

                Off White to Light Tan

                -

                Assay (GC)  ,% (min)

                95.0

                NOCIL 04-3-08

                Melting Point (Initial), °C (min)

                87.0

                D 1519

                Melting Point (Final), °C (min)

                89.0

                D 1519

                Heat Loss, % (max)

                0.30

                D 4571

                Ash, % (max)

                0.30

                D 4574

                Toluene Insoluble, % (max)

                0.30

                NOCIL 04-3-04

                Residue on 10 mesh sieve, % (max)

                Nil

                D 4570

                Residue on 20 mesh sieve, % (max)

                3.0

                D 4570

                Dedusting Agent, % (Max)

                0.5 - 1.5

                NOCIL 04-03-08

                Typical Data

                Specific gravity at  25°C

                1.33

                D 1817

                Bulk density , kg/m3

                520 - 560

                NOCIL G-44

                Bulk density (Comp), kg/m3

                710 - 750

                NOCIL G-44

                Product Information

                Solubility

                Soluble in acetone and alcohol. Insoluble in water.

                Classification

                Pre Vulcanization Inhibitor.

                Discoloration & Staining

                Non-staining and Non-discoloring.

                FDA Approval Status

                Regulated for use in articles in contact with food under BgVV  XXI, Category 4.  Not regulated for use in FDA food contact applications.

                Toxicity Data
                (Please refer to the latest
                Toxicological information.)

                Slightly toxic. (Oral LD50 rat: over 2600 mg/kg).  May cause slight skin or eye irritation and allergic skin reaction. Inhalation of odor may cause nausea.

                Handling & Personal Protection

                Avoid contact with eyes, skin and clothing. Avoid  breathing vapor or dust and ensure good ventilation. In case of eye / skin contacts wash with clean water for 10 to 15 minutes. If odor is inhaled excessively, remove the person to fresh air and remove contaminated clothing.

                Storage

                Always store in a cool (below 35ºC) & dry place in single stack pallets away from direct sun light or any other heat source to avoid grit formation.

                Packaging

                Paper Bag

                20 kg

                FIBC

                500 kg

                Storage Life

                12 months when stored as stated above.

                Color code

                None

                Pilgard PVI is an ideal pre vulcanization (scorch) inhibitor for NR, IR, NR-BR blend, SBR, NR-SBR, SBR-BR blends, NBR, CR and other diene rubber based accelerated sulphur cured compounds. Only very small dosages (e.g. 0.05-0.15 phr) can improve the scorch safety of NR based sulphenamide accelerated rubber compound by 30% without affecting the rate or state of cure. Pilgard PVI does not deactivate PPD class antidegradants and eliminates porosity problems associated with the use of common acid retarders.
                 

                Pilgard PVI is an effective scorch inhibitor with almost all types of accelerators and in all types of sulphur cured diene rubber based compounds. Pilgard PVI offers linear and predictable response and is most sensitive to sulphenamide accelerated stocks and highly unsaturated rubbers. An approximate order of response offered by Pilgard PVI to various rubbers is as follows:
                 

                NR > NBR > SBR > EPDM > Butyl (IIR) > Polychloroprene (CR)
                 

                Pilgard PVI can be used effectively in compounds based on NBR/PVC blends, polyacrylic rubbers and sulphur cured polyurethanes.
                 

                Pilgard PVI is most effective at sulphur dosages between 1.5-3.0 phr. At lower dosages of sulphur, the response offered by Pilgard PVI depends on the type of accelerator used whereas at very high dosages of sulphur levels (e.g. ebonites) the response offered by Pilgard PVI is comparatively poor. Pilgard PVI is not effective with organic peroxide, PF resin and metal oxide cures.
                 

                It is very important to determine the accurate dosage of Pilgard PVI required for producing the desired level of scorch delay under factory operating conditions for each rubber compound. This dosage can be finalized by conducting laboratory experiments followed by factory trials and evaluation of the compound for scorch safety as well as other vulcanizate properties. Fine adjustments in the dosages of Pilgard PVI should be carried out to achieve the desired minimum scorch delay and excess dosage of Pilgard PVI (than the minimum required to prevent scorch) should be avoided. This is necessary since excess dosage of Pilgard PVI can delay the cure time / render the product under cured which can affect vulcanizate properties such as state of cure, resilience, compression set, etc.
                 

                Pilgard PVI does not cause any detrimental effect on the vulcanizate properties such as tensile strength, modulus values, and resilience / heat build up, compression set or permanent set, ozone resistance and hot air aged vulcanizate properties when used at optimum dosage. Pilgard PVI does not cause contact or migration staining but can slightly discolor bright white rubber products. When very high dosages of Pilgard PVI are used (e.g. over 0.4 phr), phthalimide bloom may appear on the surface and also slight reduction in the state of cure and related properties may be experienced. The state of cure can be adjusted by a very small (e.g. 0.07-0.1 phr) increase in accelerator or sulphur dosage. The phthalimide bloom is water soluble and can easily be washed.
                 

                Pilgard PVI is an effective tool to overcome various processing limitations.
                For example:

                • Incorporation of Pilgard PVI can permit addition of curatives at an early stage of mixing for better dispersion of  curatives, reduced mixing cycle time, reduced power consumption, reduced labor and capital investment costs.
                • Permit use of higher processing speeds and temperatures during mixing, calendaring, extrusion, etc. for increased productivity and reduced processing cost,
                • Permit use of higher injection temperatures and shorter cure cycles for increased productivity.
                • Permit recovery of rubber compounds with marginal processing safety and recovery of partially scorched compound for scrap elimination.
                • Improve the storage stability of fully compounded stocks at ambient temperatures (particularly the fast curing compounds).
                   

                Pilgard PVI is generally incorporated along with accelerators and sulphur during internal mixing / mill mixing of the stocks. In case of fast curing / rework stocks; Pilgard PVI is added on cool mill.

                Pilgard PVI is widely used in the manufacture of almost all rubber products based on sulphur curable rubbers. Pilgard PVI is not used in latex compounding and the rubber products intended for contact with food/drugs.
                 

                TYPICAL DOSAGES:

                Typical dosages of Pilgard PVI required to produce the desired scorch delay depend on the type of rubber, loadings of reinforcing fillers, selection of accelerator type and dosage, sulphur dosage, etc. used in the compounding formulations and the processing operations required to be performed for the product manufacture under the existing processing conditions. Also as stated earlier, Pilgard PVI dosages have to be fine tuned to achieve only the desired level of processing safety and mould flow time and excess dosages of Pilgard PVI have to be avoided. Ambient temperatures, process water temperatures and modifications in processing machinery with respect to processing temperatures or speeds can influence Pilgard PVI dosages considerably.

                Given below are the typical dosages of Pilgard PVI for various products.
                 

                 TYPICAL DOSAGES OF PILGARD PVI

                Products

                Rubber

                Accelerator / Pilgard PVI / S, phr

                Primary
                Accelerator

                Secondary
                Accelerator

                Pilgard PVI

                S

                Truck & Bus Treads
                Bias
                Radial
                Cap
                Base
                Truck Sidewall
                Truck Carcass
                Steel cord skim


                NR
                NR-BR
                NR-BR
                NR
                NR-BR
                NR
                NR


                MOR: 0.5-0.7
                MOR: 1.1-1.5
                MOR: 1.3-1.5
                MOR: 0.5-0.7
                MOR: 0.8-1.0
                MOR: 0.7-0.8
                DCBS: 2.0   


                -
                -
                -
                -
                -
                -
                TMTM: 0.1-0.12


                0.10-0.15
                0.10-0.20
                0.10-0.20
                0.10-0.15
                0.10-0.15
                0.10-0.20
                0.10-0.15


                2.3-2.7
                1.2-1.5
                1.2-1.5
                2.2-2.5
                2.0-2.2
                Insol S: 2.5
                Insol S: 4.5

                Passenger Tyre Treads

                Passenger Tyre Sidewall
                Passenger Tyre Carcass

                NR-BR
                SBR-BR
                NR-SBR
                NR

                CBS: 1.2
                CBS: 1.5
                CBS: 1.3
                CBS: 1.0-1.2

                TMTM: 0.10
                TMTM: 0.20
                TMTM: 0.10-0.15
                TMTM: 0 - 0.10

                0.10-0.15
                0.10-0.15
                0.10-0.15
                0.10-0.20

                2.0
                1.8
                1.8
                Insol S: 2.2

                Cycle Tyre Treads

                Cycle Tyre Carcass

                NR-RR
                NR-BR
                NR

                CBS: 1.0
                CBS: 1.2
                CBS: 1.0

                TMTD: 0.10-0.15
                TMTD: 0.10-0.15
                TMTD: 0.20-0.25

                0.10-0.20
                0.10-0.15
                0.15-0.20

                2.4
                2.0
                2.5

                Retreads
                Hot Cure

                Precured

                 

                NR
                NR-BR
                NR-BR

                 

                MOR: 0.5
                MOR: 0.8-1.0
                MOR: 1.0-1.2

                 

                -
                -
                -

                 

                0.10-0.15
                0.10-0.15
                0  - 0.10

                 

                Insol S: 2.5
                Insol S: 2.0
                1.5-1.7

                Conveyor Belt Cover
                General purpose
                Heat Resistant

                 

                NR
                NR-SBR

                 

                MOR: 0.8
                CBS: 1.2-1.4

                 

                MBTS: 0.2
                -

                 

                0.10-0.20
                0.15-0.20

                 

                2.2-2.4
                1.5

                V Belts
                Base
                Cushion
                Friction

                 

                NR
                NR
                NR

                 

                CBS: 0.6-0.8
                CBS: 0.7-0.8
                CBS: 0.7-0.8

                 

                MBTS: 0.2
                MBTS: 0.3
                -

                 

                0.10-0.20
                0.10-0.15
                0.10-0.15

                 

                3.0
                2.4
                2.6

                Footwear
                DV Soles & Molded soles
                / Heels

                 

                NR-SBR

                 

                CBS: 0.8-1.0

                 

                TMTD: 0.10-0.20

                 

                0.10-0.15

                 

                2.0-2.2

                Hoses
                Tube

                Cover

                 

                NR-SBR
                NBR
                NR

                 

                CBS: 0.7-1.0
                CBS: 1.0-1.2
                CBS: 0.7-1.0

                 

                MBTS: 0.3
                TMTD: 0.10-0.20
                TMTD:  0.0-0.20

                 

                0.15-0.20
                0.15-0.20
                0.15-0.20

                 

                2.0-2.4
                1.5
                2.2-2.5

                Cables

                NR

                CBS: 1.0

                TMTD: 0.3

                0.10-0.20

                1.2-1.3

                Injection Moldings

                NR

                CBS: 0.8

                -

                0.20-0.30

                2.2-2.4

                Misc. Molded and Extruded
                Goods

                NR
                NR-SEV
                SBR
                SBR-SEV
                NBR
                NBR-SEV

                CBS: 0.7
                CBS: 1.5
                CBS: 1.2
                CBS: 2.0
                CBS: 1.0-1.2
                CBS: 1.0

                TMTD: 0.10-0.20
                TMTD: 0.5
                TMTD: 0.10-0.20
                TMTD: 0.5
                TMTD: 0.15
                TMTD: 1.0

                0.0-0.15
                0.0-0.15
                0.0-0.10
                0.0-0.10
                0.0-0.10
                0.0-0.10

                2.2
                1.5
                2.2
                0.75
                1.5
                1.0

                Pre Vulcanization Inhibitor
                Awards / Certifications
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